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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ebfbd882d0c4a476eda852b9a2df68aba7da53d3133ae4291e515c5119c1a58' 
  AND token = 'zDLNfHoDgYjiKsz7anx0bksNz4vQ2For1xC3nxdg0Ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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