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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19c29e0d2081f20dc5316ca1bae8667e516d140a64e3760d5742f9bd62337256' 
  AND token = '7WgAedtTLAW73C/PQn37iuOIbYNqKaNrA7q/lRS5PuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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