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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff09e9b3b69f7fe090d9885a4c68b21aa79e1e6fb91961d8e0060d545f5cf190' 
  AND token = 'Z5sd23+SYGoJfU9BVNZIzh67c9akIzt8jW2B0fikKyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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