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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2896f0807a102a4528643a0336ced16b14eecd790451e5eabea4fc85aca14294' 
  AND token = 'v6CdYHLzjCyion4bIgpqdrV8hx3OUcLmMX8kN1fq/6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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