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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8db9dad2a029402fd3f3b63692d7c3cbbc3fcf03763c454f596337e5bd88d4d9' 
  AND token = 'ldDuCiVqr/xBVDfibYOFkVfZLnGg492ylFlDV0+Ulq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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