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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f88c17798456cb3200c40b155330f0dd01e2202bede24406f10961c3f1648e4' 
  AND token = 'u+9gPKVYClQlS0oh0UN7TtCEU806AWVnGd38orCYVP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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