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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef06b467651e2051e5b65c2834a63d43993c807f8fe1ced25c2b1ba60edfecae' 
  AND token = 'PF5KJHJ5DJpJt3g75gu02d2TW6WmihmmiUnyiZBESlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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