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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85582fbfdc4f5fec3092a63562a0791370c40ea9ddde2a9292a070fd596c621a' 
  AND token = 'kj+L4M9BN3xom90/NIZE8rXDL4PL9f206SxH4K8Ytyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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