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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d458f807837bc1aebc2a8957299f037e31813d6b706342506d31e0f83603e02' 
  AND token = 'AgQbxA7FEZwxpyqxBxfUpZpBCE81Hms0GuqG4HcwssM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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