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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1f0105f8df6ca7a0c33c19720de35feda31a3b6b833a12329d213ad56c0eb00' 
  AND token = '2ZJyW12girBXxeKw4vSo4AHPcBo1EA0iq3AjRcnhm28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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