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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab1ca5ea22e5e4eab98cdfbb088e8d532617ef514d2aa8ffc946b88d910da297' 
  AND token = 'j4Dtm+wLThiPPjA7EQgZefoVno+HHrWg7Xd+PWtTtXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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