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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd310f9efd1abc6f70e287f6c81b936002a9a18472d2173a667dae463a0449c60' 
  AND token = 'hX2EJ/rYpjpcVAUjjeUXiM9VwZJtAZSSJx8XFldJWAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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