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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '084731896fdf47a926aafd8dfd2ca7cf81b56c2907ca0f317c0fa0457e498aa8' 
  AND token = 'u8GwTnaNeqq/9UswFo6/Q7oBtJG+p88J4rYHyRU779I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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