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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c400512c824b02bf124da5abccc016c49b1c63678f7f540847d56b2b39d3cea5' 
  AND token = '7ZDEtXlKET94ymEMEAuveXuc1lO2oscyU/FT41zEjAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00110

JSON explain

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