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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd2fcf817348fb0152b7848bab3d395e0a6b8d9b93ba48e53ace8a444da61efc' 
  AND token = 'Frik4+vw5C0gyuYVscURDxR7+Vk2+Baacfji4W3b7CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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