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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e5ee602821117fbf677de31fede5c8de45bb6fb748da019fdfc4979ac67fee4' 
  AND token = '9XSTMDYUZa8vvjG8xe543bwbP03OhgUSsRiWUIlF9Hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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