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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3c9fb09460bd0d67f7e7e8fb2abeec9bb3c1f16f894d3af84c4658d8ae32e7e' 
  AND token = '4CT1pGxooGmfNZTewC+mo4vs/c6YQN/PvLXD4ffG2Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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