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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19619b5d403acbd54be26d0e323b907ed2393c763607684cdc0417c51637aa19' 
  AND token = 'U+7RxUhFLeZ2rLyRhbcH69cFyACVjRJZGXRPBMmYux0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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