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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e89a947e839c1153693af9dcfcff1e4c4be6e00f792035928ffff6fb3712d2f' 
  AND token = 'xmjEZR+XlCzokuAeawGaF7k/MdXbpSHlCKo8Eo5HnuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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