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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e6ecf4dc611f700ccd821ecbdf8a8846b17292abd0d4628692999a9b26cd8da' 
  AND token = 'wL59TvQ6p08CUBWpxB3ZzrL9fWpszZdJk0tCKbh+Zig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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