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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '487397f32a2ac997f3d3f30e05795fd8a4552d2f88585c964b41c876bfbbb468' 
  AND token = '4/YnCNTbBc2U2iqXFQcamEhg4tT3/6UOICiqtf5sumI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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