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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73b53406e2f3447c712245a0eff2e9431d5df316ea4feb61beb4971f744f6e2b' 
  AND token = 'qHLZjfZCI2ksc98gD1ureUpenHHvfIj7IqShi1/VTlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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