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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a2edb8b9391249204551a25f62040e4caf905f8c08ec8489e7495c8c4ded61c' 
  AND token = '7tHc9hNr7SYWABsmNbbgptBjcOYRPcdnCqM+bc+64uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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