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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce23d8b69d9df8cf4ae25432e1f6644b25c18b30821e649036eee5a65d3ea0a5' 
  AND token = '4FmrrYDfAOOe4M7PDMjb3TPnA86ho3+u+1NrGSdRCdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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