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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e5dc4fc8c3134d63cc3068914bb30fdc798b439a8198d01a132ed1d300bda7f' 
  AND token = 'de+qUTFJm1PrkKNf8nzR2ADnQ8N9W73640lykVMKTJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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