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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee37134cc612c6d148d53eedf15e791e89e0c690017d269d17f5f59badd2e644' 
  AND token = '2pAvsrmncYH1gn8bfMYWd931P9Gz0WHO8/t7LajIfXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}