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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42f7d90a6bdb5f1994682b67f6595cec1008dc3a8fda30709c86b35ca5d4547c' 
  AND token = 'FTiRaAt2F3Ti0OvoN/jjFw9C6Bz/d3qYCYfevLIOTq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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