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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '079ee12de24d0a9b7d61a62c586fdaa85eb2e34e36686e87d20013ce8e180f64' 
  AND token = 'BZdPWfk30iBuiLQbqjd2+mdkc+5/LMtDTuHvo7FfOsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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