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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90c314726d15c2bd9ad486c847eb02b11d1dadb10777831d195db03907a95393' 
  AND token = '7VvkqEaGZ8i9F+8CR5Bi1CpKi2iBBwGJZeneJfFMK8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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