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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1793812d2d30f1ec9eeee74794c34d5bfc1f2105c6db609ecfb5a42ef510598f' 
  AND token = '5InNiQcUsrIfeUo4QNQ0EMEDLiXCfMYf9YOLOTPMlyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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