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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f9b9db5aa96370409b2cf8e889d3309b305eabe1f6dbd09ba7553a787a48606' 
  AND token = '6eLQub+C6WCwEbTPaV3+6Pej3khc31v44f5KQkCmYw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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