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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd56c317335076cd68e81333faeba7be04b826e86cd1d9d7a33538446013f2ae0' 
  AND token = '307P24EglR8EoTN0CcF/Lny1leC5Yz2KgpqGnS30FkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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