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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e11d081abd613823ccdc2dbd1fefd0f8f9d306157b282ac4610e5dc64faf4199' 
  AND token = 'sNGDXbuIUTD4x+QzmUeoOJMNNhQ98Vi+1b/ipGGPEkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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