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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f191721e2b7156fd245ab43c3a965e7b91aefd573e6b9d5fd63dc9c8847784f' 
  AND token = 'PtikrrXbj75EBek5ag9AmuijUhuOmQFDQXetTvPkKtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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