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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9474a4266a43bb1fe02d4f2ac992d356921a4f79ca4cc6c5357d5b94dbcf90e9' 
  AND token = 'fFSsH/jrp3G7iyqgthoPqopWkvN1TIjcC4fpxsaRLsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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