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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '519fbd314261e8cf483e6d82ea208e271b6ad67679e7c552326f2e3b43e13912' 
  AND token = '7iUt23RQZHBwNs8oL+bJwb8DCJ2obVem/A/zEkRSwD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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