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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ea893455cd02364a66132316c8b9a1e0c0e74e87eb21242de9aa866c9419364' 
  AND token = 'L1gRJtw+nemYL/7yAYls0GyBs5raXugnuRKgxF32IXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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