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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9806faeeeca207b5cffb760fdad6bf52ed56e9d8dde527a64cab64664384973b' 
  AND token = 'NcKaabWmi84vh5BtHl/5AojmOyxz4/j5+yxd4QgVMpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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