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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '418e64be8524d50ecba0a8c1d5c8bf52e3679e8b046fe8da14e61844b2cd3fb7' 
  AND token = 'ESAhLojdA6vTR7YlWE3bBlW21i7UN7jShkT3U30z//o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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