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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86b123f107b9aa0e4e8aaa43b5d7e729ef5ed6dbfc69cc87e17e0f3ed8c42b81' 
  AND token = 'Ho314jxM0c2vfxs+wkN80VL2NgAjwvJh1mpx8wUTmGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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