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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64706cc9b1457c3f220dfa411b9b83bc55ebc80b9a52f2367dd26d7458de1a95' 
  AND token = 'ByDQ5X2BpPAqrNtyb3e5QqyLIVSukw7G6G4MRr77t2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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