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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6746d15cd040c04795df6efaf70391060dfac68e5c73871d5ff19eb819cd165d' 
  AND token = 'V1xLexPlhSpWe+9eXlF2N48juwpdX9oqOSlM4HcBwPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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