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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87e8191d5cbd9b083edb7786ab257c702a72eab042a57c5e32077ad87310d3f2' 
  AND token = 'jb+GskmniUNDiI60c82TGs2E4aeTZ3obi/puHRzzVhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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