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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f38bd80893b47a3d0cd8601db0426f37febb1d6ccbb0354efe1ff7d276a38b0' 
  AND token = 'pZKH2zHlSYjHbgN16KvJ3ZRCbyz6shtuTf1rasUePlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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