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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1a3e52ff71e3f47142726c12b3a586ba8d25d92f97d9e60ef43c9540bed5563' 
  AND token = 'UASLba9o05PlV3Ly9lDDbIZj8mC8cecDH7QPHFHAWPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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