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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55ea9727d0640cdb2f620e70270f0f1a2d313a55c424567e76b44cf142fa60e0' 
  AND token = 'MNb0nMvB3lW6295J32aRMejODeh3OAV10qFOJOsMdBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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