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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30e42b42688fedea9ab4bf63a03dd10c29b9ebaf6be5a61955c3400fa159efda' 
  AND token = 'WmFy48waQGdXgfX3asHnZ2M7DTL/LE3k6uHZ126y3PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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