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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba081e3977dcb42ac4d69305055d27fd6302eaa3c6117e642e7dac45bb09be5d' 
  AND token = 'RR6yGyFVMq1h/gmcz3GV3B1ApjRN56oWn65Ka89syx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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