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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98118b0c486245641e102a3628fb861d6c657134427df756e72d48d1d6697b30' 
  AND token = 'NLO7HnW/9hWDwsIhTLTSG9mrpWsC/aCfVbecs2Bx1RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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