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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e55b8fa007b05f89c46e68967a2175d84d44cf9fb6ae6a01f10f46456bdc73af' 
  AND token = 'XqjErETOC2fXAKbT8iVixD9zP5+xsWmbaZcQ9Z32ApQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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