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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b7b58b83c3dcd5f50971cda1748425dee7dfa3fe293f3c212e48a9d68702f2b' 
  AND token = 'qSD0i0sXLOAegmNUXzQyb1L1zEM9ObBE9PCIMD+R64c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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