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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5cad55f9713745bd55c38c75811f997555eb57440343c2357f3c4a9a47b19aed' 
  AND token = 'rsEIzalIrGAL8kO+rgb+7dXJT/kP246zyqMGbcA4kms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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