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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38e362fa734bc80c8f26bbb2be45815b4a7e8ccc0033f4c307dc1202c756a0e1' 
  AND token = 'mydXBgkqy9MZVIHcsG39/0xIQwa9sobdXagFqYi1ykE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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