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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d5824ff0fc323423abbd28a6f83c12614c1b9ed46539a5128d1a1e09eca341b' 
  AND token = 'hlnVonXn2hx2hbTisEzEfzfDotKkKdkD9E3iVLGT8HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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