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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91f56f8bfe42dedf47175beb96777ca3c159b7f3218552547f0ff071dca117e2' 
  AND token = 'INgH7OAoHzec5we01G0msa8ao3apjr9l4rW66GhbZPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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