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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be7d943d0a6f7caf7459a383df5ecc8e80598540c291be8bcf2e6aa565db21b8' 
  AND token = '3sAnvu+3HbTaP7SeieQJgEE6yUWqF70jh3SS/fxwtU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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