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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '520771ef27105884c1eb289b7697c65ea4c19457f8b4dfb2f749363bb20ddade' 
  AND token = 'iESd3Td2rSGJ3yxaHMMbJiYYoA+UmiXGaDZ44kM5tm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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