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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f85cacd1bb928d11cde8e6c9fc107899fa3186da5ad37447c5aed9e04f54e472' 
  AND token = '9T928U/+KNP3M9N+ISftirM+QnosvFFQ6GtBEf8+ZFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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