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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89603b4af32d785c0150a9d2712ba924e76308850c7bcac3c9a0315fba320153' 
  AND token = '2DzKV5p7P0Vv9IWBIdl7SrbsZAmnCThD2KvKSnxq66c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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