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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7da4fc3632c3988855644c5102fa4ed1b799ff7c107e49600b0b1363df83bcaf' 
  AND token = 'Q9DSIpG8DZZXt5rrCHPv8WLFvBfJNxcAf1JF3Ru51QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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