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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1bff2901f6aaf14d702060a41e4aebc8fe25deb1cd83b84593a80515c21a6fcb' 
  AND token = 'ktNQ5g6Nqq4eFJg8g6cNbPU45QntVrLCwj+kgkahQzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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