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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd47dbe7cb24f4583ba77facfe2f3a4cbdd4f5027dfa4954bdbc22b26cf6b37aa' 
  AND token = 'dcfVYb4vv5KavRaWhN3BrTfjLs+yvDlbVM6hIepvj6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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