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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '564c089dcc14b29604d3090bfbbd34be359b034b822b7a37de2255bec3333ebb' 
  AND token = 'xHvZaTxsLxNVnRs774rFJc52aZtXPYrunHtuL5QVCYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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