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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7af7763b7db65f440832cfcede184500569690e8f79d5795f77918f3cb62a1e9' 
  AND token = 'N/JUwJiL7KMXrHIFZ1fjWrkwB0rwEHcetjytNMMjyps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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