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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '45d301324b089f40e6e02dcf2b48639d986f1bfb273cf3e2943c41c06ad5a151' 
  AND token = '70sd1+z2oLKCX/Peq1kaO0qd2j34kdmOmWV7T22wPPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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