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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d29c47495651753c57a119848c037ce3a1603608bfc0517dc7a8a16e056aba0' 
  AND token = 'r7vqnLFAdJMI9PbtfwYepdsJiiOr77CUhGg+//cXLdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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