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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a8d8dfe3c993b655c7d98d29284a74d3d62a8f244f2171b7c0ac04b02cf5501' 
  AND token = '6g04StciyqX9Mj15V7QgRkucmsa66S/il/vMkS90ud8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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