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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6fd3e0aa0711ba713f0c407c1f7aeb6b0dde428a5e0fee237ac9eac06633c1b' 
  AND token = '0ftU9obMHsRwjA26ySFsdizQo0NLA5fyQg15Kk9SE2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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