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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7166e0acac5efc29c5a0c3052d5be999e2f20b54af3a74a490cbdd07e8c498d3' 
  AND token = 'nrMuBGGDi+WhOlgJVIFUgvxtd1ai8y16iSrnnCcqT+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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