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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba2242aa4788ad10db7601dd2de597616e1d8281042c9a583eec5a0a39dca42e' 
  AND token = 'BNB80KIlilplQS1V1I7hD5nt2s04ElixFRmwiaXtVF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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