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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7bba278db7e49dc4c0852e025bb0c38917984b7d39dd2a92ea7e0858bc76c7b' 
  AND token = 'yPjK5Z/Tnw3ZupSzK2d2hylj5Hrq4h0PJC8Xy5V9O9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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