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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f34e9fb49ee05d0802d927242e5b06097cff1cd773f5fd61f60a39128eefdbcb' 
  AND token = 'mHE0b0gQA1IbbVCDM7nr/LehxPnMxXaMbboegjH4myY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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