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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c193ee0101567ab49d9849bf68552f9b58f9e25dbd2aaf5bb80ef6d13fa03e0' 
  AND token = '9VO+Y0anPF1nuzQVnmnwH9JeX/Q2atw+cT7lQkOQmkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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